Image-based document processing system providing lost image recovery

ABSTRACT

A method for recovering lost or unavailable images in an image based document processing system. Images of documents having an ordered relationship are captured and stored while the documents are sorted by a document processor into respective pockets based on data read from the documents during sorting. If images are lost or unavailable after sorting, it would be very time consuming to collect the corresponding documents from the pockets and arrange them back into their original order for a re-pass by the document processor. This problem is solved by re-passing the documents without reordering, while using previously recorded document identification and sequence data derived during the first pass on the document processor, to electronically reestablish the original ordered relationship for the document images captured on re-pass when they are stored.

CROSS REFERENCE TO RELATED PATENT APPLICATIONS

This patent application is related to the following concurrently filed patent applications:

U.S. Ser. No. 07/420,090, filed Oct. 10, 1989

U.S. Ser. No. 07/420,098, filed Oct. 10, 1989

U.S. Ser. No. 07/419,568, filed Oct. 10, 1989

U.S. Ser. No. 07/420,094, filed Oct. 10, 1989

U.S. Ser. No. 07/420,104, filed Oct. 10, 1989

U.S. Ser. No. 07/420,089, filed Oct. 10, 1989

BACKGROUND OF THE INVENTION

The present invention relates generally to improved means and methods for processing documents using electronic imaging, and more particularly, to the use of electronic imaging for processing financial documents, such as checks and related documents in a banking environment.

Today's financial services industry is facing the immense challenge of processing huge amounts of documents efficiently. Predictions that document payment methods would decline have not been realized. In fact, document payment methods have grown worldwide and are expected to continue increasing. There is thus a vital need to devise improved means and methods for processing such documents.

The use of imaging technology as an aid to document processing has been recognized as one way of significantly improving document processing, as disclosed, for example, in U.S. Pat. Nos. 4,205,780, 4,264,808, and 4,672,186. Generally, imaging involves optically scanning documents to produce electronic images that are processed electronically and stored on high capacity storage media (such as magnetic disc drives and/or optical memory) for later retrieval and display. It is apparent that document imaging provides the opportunity to reduce document handling and movement, since these electronic images can be used in place of the actual documents.

However, despite technological advances in imaging in recent years, prior art document processing systems employing imaging, such as disclosed in the aforementioned patents, do not realized sufficient improvements to justify the added implementations costs.

SUMMARY AND OBJECTS OF THE INVENTION

Accordingly, it is a broad object of the present invention to provide improved means and methods for employing electronic imaging in a document processing system.

A more specific object of the present invention is to provide such improved means and methods in a manner which significantly improves document processing productivity.

Another object of the present invention in accordance with one or more of the foregoing objects is to provide a document processing system employing imaging which is organized for operation in a manner which significantly reduces labor costs.

Further objects of the present invention involve improvements in system architecture, workstation management, transaction balancing, lost image recovery, priority document shipment, and free and missing document management.

The specific nature of the invention as well as other objects, features advantages and uses thereof will be come evident from the following detailed description along with the accompanying drawings comprised of FIGS. 1-26.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 generally illustrates an exemplary image-based bank check processing system in accordance with the invention.

FIG. 2 is a pictorial representation of FIG. 1.

FIG. 3 illustrates the front side of a typical check.

FIG. 4 illustrates the front side of a typical deposit ticket.

FIG. 5 illustrates the back side of a typical deposit ticket.

FIG. 6 illustrates a typical cash paid out slip.

FIG. 7 illustrates a typical check containing an encoded amount below the signature.

FIG. 8 illustrates the layered software architecture employed in the system of FIG. 1.

FIG. 9 illustrates the manner in which application programs are distributed throughout the system of FIG. 1.

FIG. 10 is a more specific representation of the layered software architecture employed in the system of FIG. 1.

FIG. 11 is a block diagram illustrating how the system of FIG. 1 can be expanded.

FIG. 12 is a flow chart illustrating how image recovery is provided in the system of FIG. 1.

FIG. 13 illustrates how documents may be distributed after sorting by the document processor in FIG. 1.

FIG. 13a illustrates how the distributed documents of FIG. 13 are placed in a block tray without reordering preparatory to performing a repass for image recovery purposes.

FIG. 14 is a block diagram illustrating various types of workstations employed in the system of FIG. 1.

FIG. 15 illustrates preferred hardware for the image workstations of FIG. 14.

FIGS. 16 and 17 illustrate examples of image displays which may typically appear on an amount entry workstation.

FIGS. 18 and 19 illustrate examples of screen displays which may typically appear on a MICR correction workstation.

FIG. 20 illustrates an example of a multi-window screen display which may typically appear on a balancing work station.

FIG. 21 illustrates a typical workstation keyboard.

FIGS. 22A and 22B show the upper keys and associated functions of the keyboard of FIG. 21.

FIGS. 23A, 23B, and 23C show the lower keys and associated functions of the keyboard of FIG. 21.

FIG. 24 is a flow chart illustrating the automatic steps through which a balancing workstation leads an operator in order to balance out-of-balance transactions.

FIG. 25 illustrates an example of a typical customer advice letter that may be prepared by an operator at a balancing workstation.

FIG. 26 is a flow diagram illustrating how priority transit shipment is provided in the system of FIG. 1.

DETAILED DESCRIPTION

Like numerals and characters refer to like elements throughout the figures of the drawings.

In order to demonstrate how the invention may be implemented and operated, an exemplary image-based bank check processing system, such as generally illustrated in FIG. 1, will be considered in detail. It is to be understood that this exemplary system is merely illustrative, and should not be considered as in any way limiting the scope of the invention, since the invention is applicable to other types of document processing systems, financial and otherwise.

DEPOSIT TRANSACTIONS

Before describing FIG. 1, it will be helpful to first consider the deposit type of transactions which this exemplary system will be assumed to process for the purposes of this description.

As is well known, a very common activity within a bank involves the processing of deposits made by the bank's customers. A customer is typically one who has a checking account at the bank and, from time-to-time, makes a deposit for the purpose of depositing to his/her account one or more checks which the customer has received from others. These checks may be drawn on the same bank (on-us checks) or on other banks. FIG. 3 illustrates the front side 10aof a typical check 10.

In order to make a deposit, a customer ordinarily fills out a deposit ticket listing the amount of each check to be deposited, and the total of all checks. FIG. 4 illustrates the front side 15a of a typical deposit ticket 15 listing for deposit only a single check for $250.00.

If there are many checks to be deposited and insufficient space to list them on the front side 15a of the deposit ticket 15, the check amounts are then listed on the back side 15b of the deposit ticket 15, as illustrated in FIG. 5, with the total of these checks being written on the back 15b and also on the front side 15a of the deposit ticket 15.

Note that code lines 11 and 16 are provided at the bottom of the front sides 10a and 15a of both the check 10 and deposit ticket 15, respectively. These code lines 11 and 16 typically are both humanly-readable and machine-readable, and contain information which the bank uses for processing, such as the bank on which the document is drawn, a routing/transit number, the account number of the person who wrote or made out the check or deposit ticket, and a transaction code indicating the type of document. These code lines 11 and 16 are usually comprised of well known MICR (Magnetic Ink Character Recognition) data, but may alternatively be OCR (Optical Character Recognition) data. For convenience, it will be assumed for the remainder of this description that these code lines are MICR data.

A bank receives deposit tickets and associated checks for further processing from a variety of sources, such as from the bank's tellers, through-the-mail, from automated teller machines, etc. When the transaction is made at a teller window, the customer may also choose to receive a certain amount of cash, as indicated by the $200.00 amount provided on the "LESS CASH RECEIVED" line on the front side 15a of the deposit ticket 15 in FIG. 4. In such a case, the teller will then include with the check(s) and deposit ticket of the transaction, a cash paid out slip for the corresponding cash amount of $200.00, as illustrated in FIG. 6. This cash paid out slip also has a MICR code line 19.

Instead of receiving cash, the customer might wish to deposit cash into his account, in which case the customer would enter the appropriate amount into the "CURRENCY" and/or "COIN" lines adjacent the "CASH" block on the front side 15a of the deposit ticket 15(FIG. 4). The teller would then include with the check(s) and deposit slip of the transaction, a cash paid in slip (not shown), which would be generally similar to the cash paid out slip shown in FIG. 6 (including an appropriate code line), except that it would designate cash paid in instead of cash paid out.

The deposit ticket 15 along with its associated checks 10, and any cash paid in or paid out slip constitute a transaction. Other documents, such as mortage and credit card payments could also be included in a transaction. Assuming no errors have been made (by either the customer or the teller), the "NET DEPOSIT" line on the front side 15a of the deposit ticket 15 should equal the algebraic sum of the associated check amounts and any cash paid in or paid out amount, and also the amounts of any other types of transaction items which may be included in the transaction. When this equality is present, the transaction is said to be "balanced."

It will be appreciated that a bank is required to process large quantities of transactions, such as described above, every working day. The bank needs to process these transactions for two primary purposes:

(1) To capture data from the transaction documents in order to be able to update the bank's own customer accounts. For example, a customer who made a deposit needs to have his account updated to reflect the results of the deposit.

(2) To send out checks drawn on other banks for collection. In accordance with current banking practices, it is required that a machine-readable amount be encoded on each check which for the present description will be assumed to be MICR data. This encoded amount is conventionally placed below the signature of the person who wrote the check, in line with the check code line 11, as illustrated at 21 in FIG. 7. It will be assumed that MICR encoding is used.

In accomplishing the above purposes, it is important that a check processing system provide for proofing, which in the banking industry refers to methods and apparatus for detecting, correcting and handling transaction balancing errors. It will be understood that such errors may be produced by the customer and/or teller, or may be introduced during processing. The manner in which the processing system provides for detecting and correcting such errors, as well as preventing the introduction of errors during processing, has a very significant impact on the resultant productivity and cost effectiveness of the system. This is why the use of imaging technology in document processing is not of itself a solution to the problems associated with document processing.

GENERAL SYSTEM DESCRIPTION

FIGS. 1 and 2 illustrate an exemplary embodiment of an image-based bank check processing system in accordance with the invention, which is able to take particular advantage of imaging technology in a manner which significantly enhances the productivity and cost-effectiveness of the system. As mentioned previously, this bank check processing system is presented by way of example, and should not be considered as in any way limiting the scope of the invention.

An initial step of preparation is required to prepare incoming transactions for processing by the check processing system of FIG. 1. This preparation step involves removing staples, paper clips, rubber bands etc. from the transaction documents, and arranging them in trays with proper orientation and in proper order, each tray corresponding to a block. Included in each tray is a block ticket for identifying the documents in that block, and pocket separator ticket for separating the documents into block groups after they have been sorted into pockets 32a. For the purposes of this description, and, by way of example, it will be assumed that a tray comprises a block of transactions containing about 3,000 documents, and without any transactions being split up between different blocks. To permit identification of the documents associated with each transaction, they are arranged in consecutive order in the tray. Typically, the deposit ticket of each transaction follows the other documents of the transaction.

These tray blocks of transactions are brought to a high speed document processor 32 which includes an imaging capability, and also optionally includes a microfilming capability and a capability for automatically reading the dollar amounts of the transaction documents. The operator places the tray block into an automatic document feeder of the document processor unit 32 and begins operation. The document processor 32 then reads the MICR code line on each document as the document flows through the unit, endorses audit trail information (including assigning a sequence number) on the document, optionally microfilms the document, and also captures an image of one or more sides of the document. If a document already has the dollar amount encoded, or if automatic dollar amount reading is available, this dollar amount is also read. The document processor 32 then sorts the documents (usually based on MICR data) to pockets 32a using a sort pattern which may be downloaded from a host computer 34 via a communication link 36. As will become evident hereinafter, it is advantageous to sort to pockets 32a based on the destination indicated by the MICR code line in order to facilitate meeting destination shipment deadlines. As will also become evident hereinafter, it is additionally advantageous to permit a defective MICR code line to be sorted to its corresponding pocket, so long as the destination portion is readable. The manner in which such documents having defective MICR code lines, but with readable destinations are handled will be described later on herein. Documents which cannot be handled (e.g., because of a defective MICR line without readable destination) are sorted to a reject pocket for handling by conventional reject reentry procedures. If desired, deposit slips and cash-in and cash-out slips could also be sorted to separate pockets.

The data read from the transaction documents by the document processor 32 are fed to the computer 34 via communication link 36, and typically includes each document's MICR data, amount data (if read), assigned sequence number and pocket location. The host computer 34 maintains a data base which stores the pertinent data corresponding to each transaction document being processed.

Images captured by the document processor 32 are processed, compressed, and formed into image packets. Each packet comprises one or more compressed images of a document along with an identifying header containing document identifying data (such as MICR data and sequence number). These image packets are then sent, via a high speed, point-to-point optical network 41 for storage on a high capacity disk-based magnetic storage and retrieval unit 40. The storage and retrieval unit 40 communicates with the computer 34 via communication link 42 and communication processor 34a.

Thus, after a tray block is passed through the document processor 32, the transaction documents will be in the pockets 32a, corresponding document data, such as MICR, sequence number, dollar amount (if read) and pocket location will have been sent to the host computer 34 for storage in its document data base, and corresponding images with document identifying headers will have been stored on the storage and retrieval unit 40.

Additional tray blocks are processed by the document processor 32 in the same manner as described above. In each pocket, the pocket separator tickets provided in the trays during the previously described preparation step serve to separate documents from different blocks. As pockets fill, an operator empties each pocket into a pocket tray which is identified with the corresponding pocket number. These pocket trays are moved to a holding area. When the system indicates that the documents in a particular pocket tray are ready for encoding, the tray may then be taken to a power encoder 60 for high speed encoding of the dollar amount on each check. Since, as mentioned previously, the sorting into pockets is advantageously based on shipping destination, these trays corresponding to destinations having the earliest deadlines, and which the system indicates are ready for encoding, can be encoded before those having later deadlines. In the system being described encoding of the dollar amount by a power encoder 60 is normally permitted only after the dollar amounts of all documents in a tray have been entered into the computer data base and, in addition, all corresponding transactions have been determined to be properly balanced. Batch and/or block balancing may additionally be provided as a further check on proofing accuracy.

Of course, before a transaction can be balanced, the dollar amounts of its documents must be entered into the computer data base. The images of those documents which still require dollar amount entry after being processed by the document processor 32 are sent by the storage and retrieval unit 40, via a local area network 52, to image workstations 50.

As shown in FIG. 1, the illustrated system includes a plurality of image workstations 50 which, in response to receiving images from the storage and retrieval unit 40, serve as the primary operator interface for entering dollar amounts and correction data into the computer data base, and for balancing transactions. The workstations 50 communicate with the computer 34 via network 52 and the storage and retrieval unit 40. Accordingly, data generated at the workstations 50 is sent to the computer 34 by first sending the data, via network 52, to storage and retrieval module 40, which then sends the data, via network 42 and communication processor 34a to the computer 34.

As will be described in further detail hereinafter, the workstations 50 are divided by function into various types: one type of workstations is used to key in dollar amounts by viewing document images; a second type provides for the correction of MICR code lines, while also providing for amount entry if required; a third type is used to balance transactions; and a fourth type cooperates with a printer to provide text and image hard copy output.

It will be appreciated that proofing (transaction balancing) is required to correct any transaction errors which may be present (to the extent possible) before the checks are encoded by power encoder 60 and shipped to their proper destinations. The transaction documents sorted to the reject pocket by the document processor 32 also have to be entered into the computer data base, since they also belong to transactions which are to be balanced. These rejects are handled by a well known procedure known as reject reentry. The power encoder 60 may be operated in a reject reentry mode for entry of reject data into the computer data base.

When the transactions corresponding to the documents in a pocket tray which require encoding have been determined to be balanced, the pocket tray may then be taken from the holding area to the power encoder 60, which communicates with the computer 34 via communication link 62 and communication processor 34a. An operator places the documents from the tray into the input hopper of the power encoder 60 and initiates operation. As the documents pass through the power encoder 60, each pocket separator signals the computer 34 to send to power encoder 60 the amount data for the sequence of checks which follows the pocket separator. The power encoder 60 then encodes the sequence of checks accordingly, using an appropriate printer (not shown). The power encoder 60 may also provide for further sorting of checks based on, for example, destination data contained in the MICR code line, or in response to sorting data derived from the host computer 34. The checks are thus made ready for shipment to their appropriate destinations. Any checks not fed to the power encoder 60, or those checks rejected thereby, are added to their respective group for shipping. The sorting may also be used to remove other types of transaction documents (such as pocket separators, deposit tickets and cash-in and -out slips) by sorting them to a separate pocket. Typically, a cash letter accompanies each shipped group indicating the number and amount of the checks in the group.

DESCRIPTION OF SPECIFIC FEATURES

Having generally described the exemplary check processing system of FIG. 1, various important advantageous features of the system will next be considered.

LAYERED SOFTWARE ARCHITECTURE

As illustrated in FIG. 8, the software architecture provided for the system of FIG. 1 advantageously employs a layered software architecture comprised of application programs, system services and native operating systems which permit the system to serve as a hardware platform applicable to various types of document processing systems. This layered software architecture also permits the cooperative performance of the hardware to be tailored for maximum productivity.

A particular application is composed of application programs that run on different units in the system, each application program being written in the language best suited to its own particular operating environment.

FIG. 9 illustrates the manner in which such application programs are distributed throughout the system of FIG. 1. It will be seen that application programs (indicated in black) execute on the document processor 32, the host computer 34, the image workstations 50, and the power encoder 60, each of these units having its own native unit operating system.

The system services (FIG. 8) are a library of commands that may be called by application software programs so as to provide an interface between these application programs and the native unit operating systems. More particularly, system service calls are made in the application programming language and provide the ability to interact with all system hardware components and native operating systems. System services provide this interaction independent of any other programming language or operating system restrictions. When a service is requested, the request is translated into commands that the particular involved hardware uses to perform the function.

It will be understood that the system software (application programs, operating systems, system services) may be provided in firmware (ROM), may be loaded into random access memory (RAM), or may be a combination of both. Preferably, the host computer contains the application program software and transfers appropriate portions to the various hardware components during system initialization. As indicated in FIG. 9, this facilitates customizing system operation to the requirements of a particular document processing system.

A more specific representation of the layered software architecture employed for the system of FIG. 1 is illustrated in FIG. 10, which diagrammatically shows the four categories into which system software is divided: application programs, system services, communication services (which is a subset of system services), and native operating systems. A summary of each of these categories is presented below:

    ______________________________________                                         Application programs                                                                           Enable the system to                                                           perform specific tasks                                                         useful to the end user.                                                        Application programs call                                                      system services to perform                                                     program functions.                                             System services Provide a uniform interface                                                    between application                                                            programs and system                                                            hardware native operating                                                      systems. The system                                                            services are a commandable                                                     system software language                                                       which enable applications                                                      written in different                                                           programming languages to                                                       communicate with each                                                          other and with the native                                                      operating systems.                                             Native Operating                                                                               Drive the hardware                                             systems         components and interfaces                                                      to application programs via                                                    the system services.                                                           Application programs are                                                       written to work with                                                           specific system services.                                      ______________________________________                                    

The following table describes the functions of various types of system services which may typically be provided:

    ______________________________________                                         Type of Service Function                                                       ______________________________________                                         Communication   Provides a mechanism for                                                       message-based interprogram                                                     and intertask                                                                  communications among                                                           components.                                                    File-Related    Provides the ability to                                                        store and retrieve images                                                      and other forms of                                                             information such as object-                                                    code files and program-                                                        defined document                                                               information.                                                   Image           Provides the ability to                                                        manipulate document images.                                    Image Capture   Supports the application                                                       software on the document                                                       processor 32 involved in                                                       image capture.                                                 Keyboard        Provides an application                                                        with the means to access                                                       keyboards.                                                     Nationalization Enables applications to                                                        choose what language and                                                       conventions are to be used                                                     for image workstation                                                          messages.                                                      Notice          Supports the handling and                                                      distribution of notices                                                        (messages about specific                                                       system events) in the                                                          system.                                                        Print-Related   Provides the ability to                                                        generate hard-copy reports                                                     and images.                                                    Program Management                                                                             Provides the ability for a                                                     program executing at one                                                       location in the system to                                                      initiate the execution of                                                      programs at image                                                              workstations 50, read the                                                      status of programs, and                                                        terminate programs.                                            Session Management                                                                             Provides a basis for                                                           supervising, coordinating,                                                     and controlling the actions                                                    of image workstation                                                           operators.                                                     System Directory                                                                               Provides information about                                                     the configuration of the                                                       system.                                                        Unit Management Provides the means to                                                          acquire information about                                                      system components.                                             Window-Related  Enables an application                                                         program to manage and                                                          manipulate image                                                               workstation windows.                                           ______________________________________                                    

The next following table lists access points "A" and providers "P" for the above system services (as is well known, an "access point" identifies a unit having access to a particular service, while a "provider" identifies a unit at which a particular service is provided):

    ______________________________________                                                   Doc.    Stor. &  Image         Host                                  Type of   Proc.   Retr.    Workst.                                                                               Print  Comp.                                 Service   32      Unit 40  50     Workst.                                                                               34                                    ______________________________________                                         Communication              P/A    P/A    P/A                                   File-Related      P        A      A      A                                     Image                      P/A    P/A    P/A                                   Image Capture                                                                            P/A                                                                  Keyboard                   P/A    P/A                                          Nationaliza-               P/A                                                 tion                                                                           Notice                     A      A      P/A                                   Print-Related              P/A    P/A    P/A                                   Prog. Mgt.                 P/A    P/A    A                                     Session Mgt.               P/A    P/A    A                                     Sys. Dir.                  A      A      P/A                                   Unit Mgt. P       P        P/A    P/A    P/A                                   Window Rel.                P/A                                                 ______________________________________                                    

IMAGE PROCESSING AND STORING

In order to maintain a high rate of document processing, the document processor 32 provides for capturing, processing, and compressing images in real time matching the speed of document flow. The optical network 41 permits the resulting image packets to be sent to the storage and retrieval unit 40 at a sufficiently fast rate so that images are stored on unit 40 at the image capture rate. Thus, images are available for sending to the workstations 50 a very short time after they have been captured by the document processor 32. Retrieval of images can occur one image at a time, or in groups of images defined by a list or range.

To further speed up storage and retrieval operations and increase image throughput, the storage and retrieval unit 40 is designed to provide for the concurrent storage and retrieval of images, that is, storage and retrieval operations are performed in parallel. In addition, operation is such that once written, neither the image nor its header are ever changed (commonly referred to as write-once operation). When an application determines that a block of images is no longer needed (such as when it is determined that all transactions of the block are correctly in balance), the block may then be deleted from the storage and retrieval unit 40. This temporary storage of images by the storage and retrieval unit 40 keeps the unit 40 available for use in storing newly received images.

FIG. 11 is a block diagram illustrating how the system of FIG. 1 can be expanded to provide a plurality of storage and retrieval units 40, as well as a corresponding plurality of document processors 32. Note in particular, the provision of communication link 43 which provides for transmitting images between units 40. This advantageously permits a workstation 50 to receive images from any storage and retrieval unit 40 so that the total work load can be shared amongst all the available workstations. FIG. 11 also illustrates how the storage and retrieval units 40 may communicate, via communication links 42 and 43 with an optical memory 45 and a remote communicator 47. The optical memory 45 provides the capability for archiving images, and the remote communicator provides the capability of transmitting images to a remote location.

HOST COMPUTER UNIT 34

The host computer 34 serves as the central control unit for the system of FIG. 1. It coordinates the functioning of the application software running in the system and directs data traffic. The size of the host computer 34 is minimized, since images are routed directly to the separate storage and retrieval unit 40 and do not flow to the computer 34. This separation of the storage and retrieval unit 40 from the computer 34 also provides the additional advantage of being able to use a high speed optical network, such as illustrated by optical network 41, to speed the flow of images from the document processor 32 to the storage and retrieval unit 40. Furthermore, since images do not flow to the host computer unit 34, it may be located at a remote location without the need for the high bandwidth communications which would be required for image transmission.

IMAGE RECOVERY

As mentioned previously, it is of particular advantage, for example, in order to facilitate meeting shipment deadlines, to provide for the sorting of documents by destination during their initial pass by the document processor (FIG. 1). However, such sorting distributes the documents of a tray block to different pockets. As a result, if for some reason the document images are lost or not available after sorting, it would be very time consuming to collect the documents from the pockets and arrange them back in their original order for a re-pass by the document processor 32. For example, images could be lost or unavailable because the imaging portion of the document processor 32 did not operate properly during the pass, or because the storage and retrieval unit 40 containing the images went down.

The above image recovery problem is solved in a particularly advantageous manner such that block documents can be re-imaged without arranging them in their original order The flow chart of FIG. 12 in conjunction with FIGS. 13 and 14 illustrate how this is accomplished.

Refer first to FIG. 13 which is an example of how three blocks B1, B2, and B3 may be distributed amongst four pockets P1, P2, P3, and P4 after sorting by the document processor 32. Pocket separator tickets 72 serve to divide the block documents from one another in each pocket (block tickets are typically sorted to the reject pocket). Assuming it is determined (step 110 in FIG. 12) that blocks B1 and B3 require reimaging, an operator would collect the block B1 and B3 documents from pockets 1, 2, 3, and 4 (along with the pocket separators 72) and place them in a block tray without reordering (step 112), the result being illustrated in FIG. 13a.

During repass (step 114), each pocket separator signals the computer 34 to send to the document processor 32 the first-pass data required to create the headers for the sequence of documents which follows the pocket separator. The document processor 32 uses this first-pass data to create the headers for the images produced during repass, which are then sent to the storage and retrieval unit 40 for storage (step 116 in FIG. 12) in the normal manner. The fact that the images in a stored block on the storage and retrieval unit 40 are not in the original order will not be of concern, since the document sequence number assigned on the first pass will permit the documents of a transaction to be displayed at a workstation 50 in the desired order.

WORKSTATION OPERATIONS

Important aspects of the exemplary check processing system being described herein reside in the manner in which provisions are made for prioritizing images sent to the workstations 50, for entering dollar amounts, for handling MICR correction problems, and for performing balancing.

As shown in FIG. 14, the workstation stations 50 include four types of workstations 50a, 50b, 50c, and 50d. The system is designed so that an operator can input priority data into the computer 34 for controlling the order of transmission of transaction documents to these workstations. For example, operation can be prioritized such that those transactions having documents with earlier shipment deadlines will be sent to the workstations 50 earlier than those having later deadlines.

With reference to FIG. 14, the workstation 50a, 50b, 50c, and 50d are dedicated as follows: each workstation 50a is an amount entry workstation and receives images of those documents requiring amount entry and having good MICR code lines; each workstation 50b is a MICR correction workstation and receives images of documents having deficient, but acceptable MICR code lines; each workstation 50c is a balancing workstation and receives images of out-of-balance transactions for the purpose of balancing them with operator assistance; and workstation 50d is a printing workstation which provides for printing text and graphics.

Besides the advantages derived from prioritizing the images sent to the workstations 50, as pointed out in the previous paragraph, the above described workstation dedications provide the further advantage of permitting processing operations to be overlapped. For example, transaction balancing can be performed by workstation 50c on transactions which are ready for balancing (such as those involving high priority documents), while workstation 50a is entering amounts, while workstation 50b is correcting code lines as well as entering amounts, and while workstation 50d is providing printing. As mentioned previously, in connection with FIG. 1, data entered at workstations 50a, 50b, and 50c is sent via communication network 52, storage and retrieval unit 40 and communication link 42 to computer 34 for storage in the computer's data base.

The workstations may, for example, be personal computers providing the functions described herein. Since images are stored in compressed form on the storage and retrieval unit 40, as described previously, each workstation also provides for decompressing received compressed images for display on the workstation monitor. An operator can also zoom, pan, scroll, rotate, and flip (view the rear) an image for optimal viewing. The block diagram of FIG. 15 illustrates a preferred hardware architecture for the image workstations, the components of which are described below:

    ______________________________________                                         System unit 51   Houses the System Processor                                                    52, power supply, cooling                                                      fan, I/0 bus, two serial                                                       ports, a parallel                                                              interface, and expansion                                                       card slots (e.g., for                                                          expansion memory).                                            System Processor 52                                                                             Contains the microprocessor,                                                   memory, and the interface                                                      for the keyboards. It also                                                     provides socket access to                                                      the I/0 bus.                                                  Disk-drive Controller 53                                                                        Provides the interface for                                                     the diskette drive 60 and                                                      the fixed-disk drive 61.                                      Workstation LAN (Local Area                                                                     Buffers image packets sent                                    Network) Controller 54                                                                          from the Storage and                                                           Retrieval unit 40 (FIG. 1)                                                     before they are displayed                                                      on the monitor 59 Executes                                                     the communications protocol                                                    between the image                                                              workstation and the Storage                                                    and Retrieval Unit 40.                                        Image Decompressor 55                                                                           Decompresses images (i.e.,                                                     reverses the compression                                                       process that took place in                                                     the document processor 32).                                   Display Controller 56                                                                           Generates graphics, manages                                                    display memory, defines the                                                    screen size, and enables                                                       document image manipulation                                                    for the high-resolution                                                        display monitor 59.                                           Alphanumeric keyboard                                                                           Enables operators to per-                                     (optional) 57    form basic text processing.                                   Data-entry and function                                                                         Supports high-speed data                                      keyboard 58      entry tasks and provides                                                       various function controls.                                    High-resolution display                                                                         Displays images in four                                       monitor 59       gray levels.                                                  Diskette drive 60                                                                               Enables the operator to                                                        perform read and write                                                         operations on a 31/2-inch                                                      floppy disk.                                                  Fixed-disk drive 61                                                                             Provides high storage                                                          capacity at the                                                                workstation.                                                  ______________________________________                                    

It is to be noted that a print workstation 50d is based on the same workstation hardware illustrated in FIG. 15 with the addition of a printer interface and a printer.

The operations of each of the above described types of workstations in the exemplary system being described will next be considered in further detail.

AMOUNT ENTRY WORKSTATIONS 50a

It has been found that an unusually high rate of productivity can be achieved by dedicating the operations at a data entry workstation 50a to keying in the dollar amount seen on each document image. A transaction code identifying the type of document (e.g., debit or credit) may also be entered by the operator. As previously described in connection with FIG. 14, only those document images requiring amount entry and having good MICR code lines are sent to workstation 50a.

An example of an image display which may typically appear on an amount entry workstation 50a is illustrated in FIG. 16. Note that the operator sees only an image 70 of the document (which in FIG. 16 is a check) along with a box 71 (which is initially blank) labelled "Amount." In FIG. 16, box 71 contains the entry "23500" (decimal point omitted), which is the operator's entry of the observed $235.00 amount of the check. Operation is variably controllable such that the screen will automatically switch to the next document whose amount is to be entered after the operator has entered the first 2, 3, 4, etc. digits of the observed amount. If the operator cannot read the dollar amount on the document , he/she would merely press a "pass" key, which would then cause the next document to be displayed.

FIG. 17 illustrates an example of a display screen for an amount entry workstation 50a, wherein a transaction code box 73 labelled "TC" is additionally displayed as a result of the operator having keyed in a transaction code indicative of the type of document. Workstation operators will be trained to recognize the type of document (e.g., check, deposit ticket, etc.), and enter the correct transaction code (prior to entering the amount). In FIG. 17, it will be seen that the operator has entered the transaction code "76" in box 73 and the amount "23500" in box 71. To speed up operator processing, operation may alternatively be caused to be such that transaction codes need not be entered for checks, since the system can then assume that a check is indicated when no transaction code is entered.

Since most documents will be directed to an amount entry workstation 50a operating as described above, a very high document processing rate is achievable. Furthermore, processing speed is additionally enhanced, since document images are applied to data entry workstations 50a (and in a like manner to workstations 50b) irrespective of what block they are from: in addition the sending of document images to workstations 50a and 50b can advantageously be provided using priorities which may have been entered into the system, as described previously.

While providing for fast amount entry, it is also important that the possibility of errors be minimized to the extent possible. One type of error which has been observed may occur when debit and credit items of a single-item deposit are presented sequentially to an operator. Such a single-item deposit may, for example, comprise a check (debit) $110.00 and a corresponding deposit ticket (credit) of $110.00. If the check is displayed first and the operator misreads it and keys in $100.00, the operator may without thinking key in the same incorrect amount of $100.00 for the next displayed deposit ticket. A variation of this error is the incorrect keying of the first item and the use of a repeat key on the second item. In either case, the transaction balances even though there is an error. Such errors may go undetected until a customer complains.

The exemplary processing system being described herein advantageously avoids the above described error problem by reordering the display of document images in a manner such that the operator will not know which items are associated with which deposit ticket. For example, the images could be reordered such that both items of a single check deposit will be separated by at least one item from each other. This will prevent the single-item-deposit syndrome because the operator will never be able to assume that two successive items have any relation to one another. The table below presents an example of how an image sequence of eleven items maybe reordered:

    ______________________________________                                         Actual Input Sequence                                                                          Displayed Sequence                                             ______________________________________                                         1.     deposit  10.00   1.     deposit                                                                              10.00                                     2.     check    10.00   3.     deposit                                                                              50.00                                     3.     deposit  50.00   5.     check 30.00                                     4.     check    20.00   2.     check 10.00                                     5.     check    30.00   4.     check 20.00                                     6.     deposit  95.00   6.     deposit                                                                              95.00                                     7.     check    95.00   8.     deposit                                                                              105.00                                    8.     deposit  105.00  10.    credit                                                                               35.00                                     9.     check    105.00  7.     check 95.00                                     10.    deposit  35.00   9.     check 105.00                                    11.    check    35.00   11.    check 35.00                                     ______________________________________                                    

AMOUNT ENTRY AND MICR CORRECTION WORKSTATION 50b

As will be evident from FIG. 14, workstation 50b is dedicated to receiving images of documents requiring MICR code line correction. These images are a result of the decision to sort documents to the document processor pockets 32a (FIG. 1) based on the destination indicated in the MICR code line, even for documents having defective MICR code lines, so long as the destination MICR portion is readable. A significant advantage of providing such operation is that it results in a significant reduction in the number of rejects that require the use of reject reentry procedures, which are slow and labor intensive. In order to facilitate retrieval from the storage and retrieval unit 40 (FIG. 1) of these document images requiring MICR correction, they are stored in a separate code correction file on the storage and retrieval unit 40.

The manner in which the code correction workstation 50b typically operates will be understood by reference to FIG. 18 which illustrates a screen display showing the image of a check 80 requiring MICR code line correction, along with a plurality of MICR code line boxes 81, 82, 83, 84, 85, and an amount entry box 86. When the display first appears on the screen, those portions of the MICR code lines which are known (box 84) appear in the appropriate boxes 81 to 85. Those which are not known are left blank. If known, the amount appears in box 86. If a box contains an entry which was only partially readable (box 83), an asterisk "*" appears to indicate each character or number, which needs entry.

In response to the display shown in FIG. 18, an operator would view the displayed check image 80, and substitute "9" (83a) for the first asterisk in box 83, and "2" (83b) for the second asterisk in box 83. The operator would also provide entries for any blank boxes requiring entry, and then would be prompted to enter the check amount $235.00 (and transaction code, if required). The display would then switch to a new document image.

FIG. 19 illustrates a display by the code correction workstation 50b of a deposit ticket 87 in which the account number is handwritten (84a) on the deposit ticket, usually by a teller to identify the account to which the deposit ticket applies. An operator may conveniently enter this handwritten account number in the appropriate box 84 by viewing the document image.

As described in connection with the amount entry workstation 50a, an operator of a MICR correction workstation 50b can depress a "pass" function key if a required entry cannot be read from the check image.

BALANCING WORKSTATION 50c

The balancing workstations 50c receives transactions which do not balance for the purpose of attempting to get them into balance. The workstation 50 is also typically used for balancing blocks and/or batches of transactions. An out-of-balance transaction may, for example, be a deposit transaction for which the total on the deposit ticket (FIG. 4) does not equal the sum of the checks being deposited. Of course, balancing will not be attempted for a transaction until it has had its MICR code corrected by workstation 50b (if necessary), and has had its dollar amount entered or attempted to be entered (either automatically by document processor 32 in FIG. 1, or by imaging using workstation 50a or 50b). The basic manner in which a balancing workstation 50c provides for handling a transaction will next be considered.

Workstation 50c is advantageously provided with a multi-window display (FIG. 20) controlled by a keyboard 90 (FIGS. 21-23). FIG. 21 illustrates the overall layout of the keyboard 90. FIG. 22 illustrates the upper portion 90a of the keyboard, and FIG. 23 illustrates the lower portion 90b of the keyboard. FIGS. 22 and 23 show the labels of the keys. Also included are short description describing the operation of particular keys. The number keys in the center of the lower keyboard portion 90b are for entering numbers.

Workstation 50c is advantageously provided with a multi-window display (FIG. 20) corresponding to a single transaction. It is to be understood that each window is controllable (flip, rotate, scroll, zoom, etc.) using the various window control keys of the keyboard (FIGS. 22 and 23). It is also to be understood that the particular multi-window display and keyboard shown are merely illustrative.

A first window W1 in FIG. 20 displays an image of a deposit ticket 15 indicating a total of $686.30. The other side may be seen by pressing the "Flip" key in the top row in FIG. 22.

A second window W2 in FIG. 20 provides a summary of the transaction derived from the database in computer 34. The "CR" amount (686.30) in window W2 is the deposit ticket total, the "DB" amount (676.30) is the sum of the checks being deposited, and the "DIF" amount (10.00) is the difference between the "CR" and "DB" amounts, that is, the amount by which the transaction is out of balance. Note that window W2 also indicates the number of "CR" and "DB" items, 1 for "CR" (deposit ticket) and 6 for "DB" (checks). Movement between windows is accomplished by using the "Backward Window" and "Forward Window" keys in FIG. 23.

A third window W3 in FIG. 20 labeled "CREDITS" lists each of the "CR" (deposit ticket) amounts. The deposit ticket 15 shown in window W1 is the only listing in window W3 since the displayed transaction has only one credit item.

A fourth window W4 in FIG. 20 labeled "DEBITS" lists each of the "DB" (check) amounts. Accordingly window W3 lists the amount of each of the six debits (checks) whose sum is equal to the total debit "DB" amount in window W2.

A fifth window W5 in FIG. 20 shows a partial image of the particular debit (check) Whose amount is highlighted in window W4, which is the check for 235.00. The particular check which is highlighted can be changed by using the up-or-down keys in FIG. 23. Manipulation of the check shown in window W5, such as scrolling (to see other parts of the check), flipping, etc., is accomplished by appropriate use of particular keyboard keys (FIGS. 22 and 23). It will be understood that, if there were more credit items shown in the credit window W3, window W1 would display the particular credit item highlighted.

A sixth window W6 in FIG. 20 is a dialogue window which is used to permit an operator to dialogue with the computer such as by choosing a particular operation to be performed from a menu. As an example, window W6 illustrates a "CUSTOMER ADVICE MENU". Other types of dialogue activity can also be provided, as will become evident hereinafter.

A seventh window W7 in FIG. 20 at the bottom of the screen shows MICR code line data for a highlighted item in window W3 or W4, dependent upon which immediately preceding window was active. An active window has a thick black border, as illustrated for window W6 in FIG. 20. Movement between boxes (fields) in window W7 is accomplished using the "Backward Field" and "Forward Field" keys in FIG. 23.

Having described an example of the multi-window display capabilities provided by a balancing workstation 50c, the advantageous manner in which transaction balancing is performed will next be considered. Although this description will be directed to transaction balancing, it will be evident therefrom how batch and/or block balancing may also be provided, if desired, for multi-batch deposits as well as for multi-deposit batches.

When an operator signs-on at a balancing workstation 50c for transaction balancing, he or she typically first requests a display of blocks of transactions to be worked on. A screen will then be displayed indicating a plurality of blocks and pertinent information about each, such as the priority of a block, its current status, the credit, debit, and out-of-balance amounts for the block, etc.

The balancing workstation 50c is programmed to automatically lead the operator through various steps in order to attempt to balance out-of-balance transactions. Operation pauses only when operator action is required. These steps are illustrated in FIG. 24 and described in further detail below:

BLOCK SELECTION (FIG. 24, STEP 200)

The initial step is to select a block for balancing.

REJECT REENTRY FEE AND MISSING MATCHUP (FIG. 24, STEP 202)

The computer 34 (FIG. 1) sends to the balancing workstation 50c the free and missing items from reject reentry. These items are the documents which were entered using reject/reentry procedures, as described previously. Each out-of-balance transaction is examined in turn to determine whether any items are missing from the transaction. If so, a determination is made as to whether any of the free items could be a possible match for any of the missing items. If a possible match is encountered, the image of the missing item and the code line for the free item are displayed to the balancing operator on the workstation screen for verification. The operator simply answers "yes" or "no" to the matchup. Operation proceeds in this manner until all out-of-balance transactions have been handled, after which operation proceeds to the next step.

AUTOMATIC FORCE BALANCING (FIG. 24, STEP 204)

During automatic force balancing each out-of-balance transaction is examined to determine if any are out of balance by less than a predetermined dollar amount specified by the user. If there are any transactions fitting this description, the transaction is automatically forced into balance without operator intervention. Operation then proceeds to the next step after all out-of-balance transactions have been handled. Any transactions which were balanced as a result of this step are removed from the list of out-of-balance transactions.

AMOUNT REKEY (FIG. 24, STEP 206)

The user also specifies the maximum number of items in a transaction that will qualify the transaction for amount rekey. For each out-of-balance transaction which contains less than the number of items specified by the user, the transaction is presented to the balancing operator for rekey. During rekey, the items in the transaction are processed to determine if any are suspects for keying errors. These items are presented to the operator first, followed by all other items in the transaction. If an amount is keyed that equals the amount entered during amount entry, the next item is displayed. If the amount keyed does not equal the amount entered during amount entry, but it causes the transaction to balance, the remaining items of the transaction are not displayed, and operation proceeds to the next out-of-balance transaction. If the amount keyed is not equal to the amount entered during amount entry and the transaction is still out of balance, the amount entered during rekey is taken as the new amount and the next item is displayed. The amount rekey procedure is not performed for those transactions containing PASSED items. After all out-of-balance transactions have been handled, operation proceeds to the next step.

THINK BALANCING (FIG. 25, STEP 208)

This is the step of the balancing function that involves interaction with the balancing operator. At this point, the operator may request a list of the out-of-balance transactions in the block and select the one which is to be subject to think balancing. Alternatively, the system could make this selection automatically. In either case, the think balancing operations are the same.

When an out-of-balance transaction is selected for think balancing, it is examined by the system for errors, as indicated below, to determine if there are suspect items that could be causing the out-of-balance condition.

    ______________________________________                                         KEYING          TRANSACTION LEVEL                                              ______________________________________                                         Transpositions  Double Posted Items                                            Shifted Digits  DR Entered as CR,                                              Extra Digits    CR Entered as DR                                               Missing Digits  Misplaced Item                                                                 Extra Item                                                                     Missing Item                                                                   Common MICR Misreads                                           ______________________________________                                    

When the transaction is displayed to the balancing operator (FIG. 20), the first item in each list in the credit and debit windows W3 and W4 that is suspect will be highlighted in order to guide the operator to that item first. There is also an area on the right of the items which can be used to provide comments about the items. For example, if the system considered the suspect item to be an extra item, the comment "extra item" could be provided (not shown in FIG. 20). The dialogue window W6 in FIG. 20 could also be used to provide additional facts.

The operator now tries to use the contents of the display (FIG. 20) to balance the transaction. All of the functions of the keyboard of FIGS. 22 and 23 are available to manipulate the multi-window display, as described previously. The speed at which an out-of-balance transaction can be corrected will be evident by considering the particular transaction display shown in FIG. 20. It is readily apparent from a comparison of the amounts listed on the deposit ticket shown in window W1, with the check amounts listed in window W4, that the $245.00 amount listed on the deposit slip is an incorrect listing, and should be $235.00, which has been highlighted as being suspect in window W4. This is confirmed by the corresponding image of the check in window W5, which is for $235.00.

A further advantage of the multi-window display shown in FIG. 20 is that a customer advice for advising the customer of an incorrect listing (including images) can be prepared at the workstation 50c while the transaction is being displayed. This is accomplished by depressing the "ADVICE" key in FIG. 22, which will produce a menu in the dialogue window W6 to permit the operator to prepare the advice. FIG. 25 illustrates an example of a typical customer advice letter that may be prepared by an operator using the dialogue window W6. Note that images of the deposit slip and check are advantageously provided by the operator requesting same during the operator's dialogue with the dialogue window W6.

If an operator cannot balance a transaction, the operator then presses the "Block Pass" key in FIG. 22, causing a new transaction to be displayed for balancing.

IMAGE FREE AND MISSING MANAGEMENT

The balancing workstation 50a also advantageously provides for handling a situation where a document (item) becomes separated from its transaction, and is erroneously placed with another transaction. This could occur, for example, when preparing documents for the document processor 32 in FIG. 1. Such a misplaced item will be sorted to its proper pocket (assuming its MICR is acceptable); however, the transaction which lost the item, as well as the transaction which gained the item, will not balance. In order to provide for balancing in such situations, computer 34 (FIG. 1) provides a free item store for storing free items. If, during think balancing, an operator determines that an item in window W3 or W4 (FIG. 20) of a displayed transaction is a free (extra) item (e.g., in response to the "Comments" in window W3 or W4 indicating such), the operator can logically remove the item from the transaction and place the item in the free item store. The operator does this by highlighting the item in its respective window (W3 or W4), and then pressing the "Make Free Item" key in FIG. 23. When appropriate, additional identifying data for the document may be provided by the operator using the dialogue window W6.

On the other hand, if an operator, while viewing the display of a transaction during think balancing determines that an item is missing, the operator may want to see what is in the free item store. To do this, the operator presses the "Display Free Items" key in FIG. 23, which causes candidate free items to be displayed in the dialogue window W6 (FIG. 20). The operator can limit the entries displayed by entering free item search data into the dialogue window W6. For example, if the missing item should have an amount of $100.00, the operator by appropriate entry in the dialogue window W6 can limit the free item search to just those items having an amount of $100.00, in which case, the resulting display in the dialogue window W6 will only be of items having an amount of $100.00. If the operator determines that a displayed free store item belongs to the displayed transaction, the operator can then logically place the missing item in the transaction by pressing the "Get Free Item" key in FIG. 23. If the transaction is thus brought into balance, operation will proceed to the next out-of-balance transaction.

If a missing item is not found for a transaction, the operator can create a missing item advice using the dialogue window W6 (FIG. 20) in a generally similar manner to that previously described for a customer advice (FIG. 25). If at a later time the block containing the missing transaction is worked on again, and the missing item is found (e.g., because the missing item was placed in the free item store after the previous attempt at balancing), the missing item can at this later time be logically placed in the transaction to balance the transaction, as described above. The previously prepared missing item advice will then be deleted. An advice can thus be electronically created at the time it appears to be required (which is the most efficient time to create an advice). Then, if the missing item is found at a later time, the electronically created advice will be deleted and will, thus, not be printed.

The free item store described above is also advantageously employed during the system's transaction level search for "Missing Item" listed in the previously described think balancing error search. When the search detects a missing item in the displayed transaction, candidate items from the free item store will automatically be listed in the dialogue window W6 (FIG. 20) for use by the operator.

PRIORITY TRANSIT SHIPMENT

It will be remembered that the document processor 32 (FIG. 1) sorts documents into pockets based on MICR destination data, after which the documents in each pocket have to wait for their corresponding transactions to be balanced before they can be encoded by power encoder 60 and shipped. For example, particular pockets may contain checks which have to be shipped by a particular deadline which is very near. Of course, they could be power encoded "as is," which is undesirable since there may be checks in this pocket which are from transactions that have not been balanced.

The document processing system being described herein provides a particularly advantageous way of handling the above situation, as illustrated by the flow diagram of FIG. 26. As indicated by step 300, a supervisor schedules one or more pockets for priority transit shipment rekey; unbalanced blocks are tagged accordingly. An operator at a balancing workstation 50c (step 302) then requests a tagged block (step 302). The system searches the requested block for items that are part of an out-of-balance transaction and also are in a scheduled pocket (step 304). These items (and these items only) are presented to the operator in the same fashion as during amount entry at an amount entry workstation 50a (step 306). The operator enters the amount as if seeing the item for the first time. The amount that was entered in a previous function is not displayed to the operator. When an amount is entered, one of the following three scenarios takes place (step 308):

(1)--If the amount entered is the same amount that is in the computer data base for this item, this amount is not changed.

(2)--If the amount entered is different from the amount in the computer data base for this item, but the new amount causes the transaction to balance, the data base amount will be changed to this new amount.

(3)--If the amount entered is different from the amount currently captured for the item, and the new amount does not resolve the out of balance condition, the operator may tag the item for a rekey or simply have the item outsorted.

As indicated by step 310 in FIG. 26, steps 302-308 are repeated for all other tagged blocks. The documents in the scheduled pockets are then encoded by the power encoder 60 (FIG. 1) and shipped (step 312). If later balancing reveals an item was incorrectly encoded, an adjustment suspect report is printed to advise that an incorrectly encoded item was shipped.

It is to be understood that the present invention is not limited to the particular implementations and/or examples disclosed herein, and is accordingly to be considered as including all modifications and variations coming with the scope of the appended claims. 

What is claimed is:
 1. In an image based document processing system for processing blocks of documents, wherein each block comprises documents having a predetermined ordered relationship, and wherein each document includes machine-readable data thereon, a method for sorting said documents, capturing images of said documents and for recovering images which become lost or unavailable after their respective documents are sorted, said method comprising:arranging each block of documents for sorting based on its ordered relationship; sorting a plurality of blocks of documents into a plurality of pockets such that the documents of a block are sorted into a plurality of different pockets, thereby disturbing said predetermined ordered relationship; said sorting including reading said machine-readable data on each document for determining the pocket to which each document is to be sorted; capturing images of said documents during said sorting; storing captured images so as to provide for retrievability based on said predetermined ordered relationship; deriving document identifying data during said sorting; also deriving document order data during said sorting indicative of said predetermined ordered relationship; determining a sorted block of documents in said pockets which requires reimaging because documents in said block are lost or unavailable, the documents in said sorted block being in a plurality of different pockets; collecting documents corresponding to said sorted block of documents from said pockets for resorting without reordering the collected documents into said predetermined ordered relationship, again sorting the collected documents while capturing images thereof and deriving document identifying data therefrom during said again sorting; and storing the captured images produced by the step of again sorting using the document identifying data derived therefrom in conjunction with the document identification data and document order data derived from the first sorting so as to provide for retrievability of the stored images based on said predetermined ordered relationship.
 2. The method of claim 1, wherein said document identifying data is derived by machine reading data provided on said document.
 3. The method of claim 1, wherein said document order data is derived by assigning an identifying number to each document.
 4. The method of claim 3, including retrieving and displaying stored document images.
 5. The method of claim 3, wherein said sorting also includes storing corresponding document identification data with document images.
 6. The method of claim 5, wherein said arranging serves to group documents into transactions with the documents of each transaction being arranged sequentially.
 7. The method of claim 3, wherein sad identifying number is a sequence number.
 8. The method of claim 7, wherein said documents are financial documents, and wherein each transaction includes debit and credit documents. 